Mercurial > hg > blitz_condensed
annotate src/org/dancres/blitz/disk/WriteDaemon.java @ 34:6f68e94c1fb8 default tip
Add CondensedStats monitoring utility, equivalent to vmstat
author | Dominic Cleal <dominic-cleal@cdo2.com> |
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date | Thu, 05 Aug 2010 11:07:25 +0100 |
parents | 3dc0c5604566 |
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rev | line source |
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0
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1 package org.dancres.blitz.disk; |
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2 |
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3 import java.util.logging.*; |
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4 |
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5 import net.jini.config.ConfigurationException; |
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6 |
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7 import EDU.oswego.cs.dl.util.concurrent.LinkedQueue; |
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8 import EDU.oswego.cs.dl.util.concurrent.PooledExecutor; |
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9 |
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10 import org.dancres.blitz.Logging; |
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11 |
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12 import org.dancres.blitz.ActiveObject; |
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13 import org.dancres.blitz.ActiveObjectRegistry; |
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14 |
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15 import org.dancres.blitz.config.ConfigurationFactory; |
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16 |
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17 import org.dancres.blitz.task.Tasks; |
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18 import org.dancres.blitz.task.Task; |
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19 |
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20 import org.dancres.blitz.stats.StatGenerator; |
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21 import org.dancres.blitz.stats.Stat; |
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22 import org.dancres.blitz.stats.StatsBoard; |
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23 import org.dancres.blitz.stats.IOStat; |
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24 |
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25 /** |
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26 <p> Certain elements of Blitz (such as ArcCache) require all writes to be |
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27 asynchronous to avoid deadlock situations and reduce time spent waiting for |
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28 I/O completion by a client thread. WriteDaemon provides the asynchronous |
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29 I/O infrastructure to satisfy such requirements. </p> |
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30 |
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31 <p> We stop when Disk is stop'd which allows for proper sync'ing </p> |
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32 |
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33 <p>We can only have one thread for writing at this moment because: |
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34 <ol> |
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35 <li>WriteBuffer assumes serialized updating of images. If two threads |
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36 start performing jobs on the same UID, then there's currently scope for |
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37 a collision. The problem is compounded by the fact that we can't simply |
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38 requeue the job because that will break checkpointing/sync'ing</li> |
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39 <li>Sync'ing assumes that there's only one thread which will execute the |
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40 appropriate callback placed in the queue once all prior Jobs have been |
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41 dispatched. This ordering dependency is what complicates the WriteBuffer |
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42 issue above.</li> |
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43 <li>There's an ordering issue - we must write before we decide to then |
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44 delete something that is on disk.</li> |
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45 </ol> |
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46 </p> |
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47 |
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48 @see org.dancres.blitz.arc.ArcCache |
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49 */ |
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50 public class WriteDaemon implements StatGenerator { |
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51 static Logger theLogger = |
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52 Logging.newLogger("org.dancres.blitz.disk.WriteDaemon"); |
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53 |
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54 private static int MAX_WRITE_THREADS; |
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55 private static int THREAD_KEEPALIVE; |
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56 private static int DESIRED_PENDING_WRITES; |
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57 private static int THROTTLE_PENDING_WRITES; |
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58 private static long THROTTLE_PAUSE; |
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59 |
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60 static { |
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61 try { |
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62 MAX_WRITE_THREADS = ((Integer) |
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63 ConfigurationFactory.getEntry("maxWriteThreads", |
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64 int.class, |
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65 new Integer(5))).intValue(); |
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66 THREAD_KEEPALIVE = ((Integer) |
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67 ConfigurationFactory.getEntry("threadKeepalive", |
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68 int.class, |
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69 new Integer(60000))).intValue(); |
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70 DESIRED_PENDING_WRITES = ((Integer) |
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71 ConfigurationFactory.getEntry("desiredPendingWrites", |
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72 int.class, |
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73 new Integer(20))).intValue(); |
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74 |
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75 THROTTLE_PENDING_WRITES = ((Integer) |
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76 ConfigurationFactory.getEntry("throttlePendingWrites", |
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77 int.class, |
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78 new Integer(Integer.MAX_VALUE))).intValue(); |
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79 THROTTLE_PAUSE = ((Long) |
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80 ConfigurationFactory.getEntry("throttlePause", |
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81 long.class, |
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82 new Long(50))).longValue(); |
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83 } catch (ConfigurationException aCE) { |
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84 } |
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85 } |
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86 |
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87 private static WriteDaemon theDaemon = new WriteDaemon(); |
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88 |
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89 private int thePendingCount; |
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90 private LinkedQueue thePendingUpdates = new LinkedQueue(); |
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91 |
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92 private LinkedQueue theAsyncUpdates; |
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93 private PooledExecutor theWriters; |
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94 |
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95 private LinkedQueue theCompletions; |
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96 private PooledExecutor theCompleters; |
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97 |
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98 private IOStats theIOStats = new IOStats(); |
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99 |
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100 private long theStatId = StatGenerator.UNSET_ID; |
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101 private int theThrottleCount = 0; |
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102 |
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103 private WriteDaemon() { |
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104 theAsyncUpdates = new LinkedQueue(); |
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105 theCompletions = new LinkedQueue(); |
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106 |
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107 theWriters = new PooledExecutor(theAsyncUpdates, MAX_WRITE_THREADS); |
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108 theCompleters = new PooledExecutor(theCompletions, 1); |
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109 |
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110 theLogger.log(Level.INFO, "Async keepalive: " + THREAD_KEEPALIVE); |
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111 theLogger.log(Level.INFO, "Pending write size: " + |
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112 DESIRED_PENDING_WRITES); |
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113 theLogger.log(Level.INFO, "Throttle write size: " + |
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114 THROTTLE_PENDING_WRITES); |
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115 theLogger.log(Level.INFO, "Throttle pause: " + |
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116 THROTTLE_PAUSE); |
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117 |
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118 theWriters.setKeepAliveTime(THREAD_KEEPALIVE); |
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119 theCompleters.setKeepAliveTime(THREAD_KEEPALIVE); |
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120 |
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121 StatsBoard.get().add(this); |
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122 } |
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123 |
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124 public static WriteDaemon get() { |
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125 return theDaemon; |
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126 } |
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127 |
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128 /** |
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129 Queue a task for execution by the WriteDaemon thread. |
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130 */ |
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131 public void queue(Runnable anUpdate) { |
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132 |
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133 // If the write queue is getting too large, start stalling |
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134 if (theIOStats.getQueueSize() > THROTTLE_PENDING_WRITES) { |
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135 ++theThrottleCount; |
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136 |
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137 theLogger.log(Level.WARNING, |
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138 "Write queue overflowing - THROTTLING"); |
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139 |
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140 try { |
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141 Thread.sleep(THROTTLE_PAUSE); |
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142 } catch (InterruptedException anIE) { |
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143 theLogger.log(Level.SEVERE, "Throttle broken!"); |
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144 } |
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145 } |
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146 |
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147 synchronized(this) { |
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148 try { |
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149 thePendingUpdates.put(new OutputTracker(anUpdate)); |
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150 ++thePendingCount; |
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151 |
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152 if (thePendingCount >= DESIRED_PENDING_WRITES) { |
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153 pushImpl(); |
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154 } |
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155 } catch (InterruptedException anIE) { |
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156 theLogger.log(Level.SEVERE, "Failed to queue update", anIE); |
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157 } |
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158 } |
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159 |
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160 theIOStats.incAsyncInCount(); |
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161 } |
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162 |
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163 /** |
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164 Should only be called from within a sync block. |
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165 */ |
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166 private void pushImpl() { |
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167 Object myTask; |
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168 |
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169 try { |
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170 while ((myTask = thePendingUpdates.poll(0)) != null) { |
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171 theWriters.execute((Runnable) myTask); |
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172 } |
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173 } catch (InterruptedException anIE) { |
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174 } |
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175 |
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176 thePendingCount = 0; |
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177 } |
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178 |
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179 /** |
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180 Force the queue to be processed |
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181 */ |
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182 void push() { |
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183 synchronized(this) { |
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184 pushImpl(); |
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185 } |
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186 } |
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187 |
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188 /** |
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189 <p>Force the updates in the queue to disk. On completion, invoke the |
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190 passed task. Note this task is processed asynchronously outside |
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191 of the WriteDaemon thread. This allows the WriteDaemon to continue |
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192 processing updates whilst the completion task runs.</p> |
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193 |
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194 <p>If you want a task to be performed synchronously by the WriteDaemon |
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195 after other requests, <code>queue</code> the task and invoke |
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196 <code>push</code>.</p> |
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197 */ |
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198 void push(Task aCompletionTask) { |
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199 if (aCompletionTask == null) |
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200 throw new IllegalArgumentException(); |
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201 else { |
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202 synchronized(this) { |
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203 /* |
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204 We ensure the passed task doesn't execute until the |
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205 queue has been emptied by putting a barrier task at the end |
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206 of the queue. Thus, when we force the queue, this barrier |
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207 will only execute once all preceeding updates have been |
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208 performed. |
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209 */ |
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210 queue(new Scheduler(aCompletionTask)); |
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211 pushImpl(); |
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212 } |
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213 } |
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214 } |
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215 |
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216 void halt() { |
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217 theLogger.log(Level.INFO, "WriteDaemon doing halt"); |
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218 theWriters.shutdownAfterProcessingCurrentlyQueuedTasks(); |
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219 theCompleters.shutdownAfterProcessingCurrentlyQueuedTasks(); |
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220 theLogger.log(Level.INFO, "WriteDaemon done halt"); |
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221 } |
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222 |
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223 /** |
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224 We do not run the completion task in-line. This is potentially time |
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225 consuming and we have more important things to do (write updates) so |
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226 we palm the completion task off to a separate thread pool when we've |
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227 done the necessary work. |
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228 */ |
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229 private class Scheduler implements Runnable { |
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230 private Task theTask; |
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231 |
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232 Scheduler(Task aCompletionTask) { |
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233 theTask = aCompletionTask; |
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234 } |
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235 |
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236 public void run() { |
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237 try { |
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238 theCompleters.execute(theTask); |
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239 } catch (InterruptedException anIE) { |
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240 theLogger.log(Level.SEVERE, "Failed to scheduler sync completion task", anIE); |
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241 } |
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242 } |
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243 } |
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244 |
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245 private class OutputTracker implements Runnable { |
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246 private Runnable theWrite; |
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247 |
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248 OutputTracker(Runnable aRunnable) { |
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249 theWrite = aRunnable; |
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250 } |
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251 |
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252 public void run() { |
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253 theWrite.run(); |
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254 |
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255 theIOStats.incAsyncOutCount(); |
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256 } |
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257 } |
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258 |
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259 /** |
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260 @return the id of the StatGenerator that produced the stat |
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261 AdministrableStat.UNSET_ID if the id has never been set |
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262 */ |
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263 public long getId() { |
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264 return theStatId; |
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265 } |
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266 |
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267 public void setId(long anId) { |
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268 theStatId = anId; |
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269 } |
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270 |
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271 public Stat generate() { |
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272 return new IOStat(theStatId, theIOStats.getTimePerIn(), |
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273 theIOStats.getTimePerOut(), theIOStats.getInOutRatio(), |
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274 theIOStats.getQueueSize(), theThrottleCount); |
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275 } |
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276 } |